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The Impact of the First Galaxies on Cosmic Dawn and Reionization
Julian B. Muñoz, Yuxiang Qin, Andrei Mesinger +3
The formation of the first galaxies during cosmic dawn and reionization (at redshifts ), triggered the last major phase transition of our universe, as hydrogen evolved from…
GALLUMI: A Galaxy Luminosity Function Pipeline for Cosmology and Astrophysics
Nashwan Sabti, Julian B. Muñoz, Diego Blas
Observations of high-redshift galaxies have provided us with a rich tool to study the physics at play during the epoch of reionisation. The luminosity function (LF) of these object…
New Roads to the Small-Scale Universe: Measurements of the Clustering of Matter with the High-Redshift UV Galaxy Luminosity Function
Nashwan Sabti, Julian B. Muñoz, Diego Blas
The epochs of cosmic dawn and reionisation present promising avenues for understanding the role of dark matter (DM) in our cosmos. The first galaxies that populated the Universe du…
A fully Lagrangian, non-parametric bias model for dark-matter halos
Xiaohan Wu, Julian B. Munoz, Daniel Eisenstein
We present a non-parametric Lagrangian biasing model and fit the ratio of the halo and mass densities at the field level using the mass-weighted halo field in the AbacusSummit simu…
HERA Phase I Limits on the Cosmic 21-cm Signal: Constraints on Astrophysics and Cosmology During the Epoch of Reionization
The HERA Collaboration, Zara Abdurashidova, James E. Aguirre +81
Recently, the Hydrogen Epoch of Reionization Array (HERA) collaboration has produced the experiment's first upper limits on the power spectrum of 21-cm fluctuations at z~8 and 10.…
Small-scale clumping at recombination and the Hubble tension
Michael Rashkovetskyi, Julian B. Muñoz, Daniel J. Eisenstein +1
Despite the success of the standard CDM model of cosmology, recent data improvements have made tensions emerge between low- and high-redshift observables, most importantly in de…
Cosmological Constraints on Light (but Massive) Relics
Weishuang Linda Xu, Julian B. Muñoz, Cora Dvorkin
Many scenarios of physics beyond the standard model predict new light, weakly coupled degrees of freedom, populated in the early universe and remaining as cosmic relics today. Due…
Probing Compensated Isocurvature with the 21-cm Signal during Cosmic Dawn
Selim C. Hotinli, Thomas Binnie, Julian B. Muñoz +2
Upcoming measurements of the 21-cm line of neutral hydrogen will open a new observational window into the early stages of structure growth, providing a unique opportunity for probi…
Near future MeV telescopes can discover asteroid-mass primordial black hole dark matter
Anupam Ray, Ranjan Laha, Julian B. Muñoz +1
Primordial black holes (PBHs), formed out of large overdensities in the early Universe, are a viable dark matter (DM) candidate over a broad range of masses. Ultra-light, asteroid-…